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4.18 seems pretty stable for me. Worked a whole day without a single crash. Kind of simple project though, not many structs (the source of most of my crashes). Also, compiled ok. I haven't noticed the performance issues. But I hope it is improved before I do. hahahaha

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While the engine didn't crash on me (4.18 source build), I had custom structs and variables set to those struct types. If I modified the arrangement of the struct it completely corrupted the blueprint. Making it un compilable and the references to the variables broke and I couldn't even delete them from the editor. Had to create the blueprint from scratch and now I'm staying away from structs like a disease.